NEW BOOKS
Guaranteed accuracy to ±0.0025 ml. with 0.1 ml. KONTES Precision Grade Pipettes (See graph below for other sizes.)
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Precision Grade Pipettes serially numbered ; supplied with a matching numbered Certificate which guarantees volumetric accuracies up to ±0.0025 ml. for the 0.1 ml. capacity, and conformance to NBS specifications.
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A complete line of Transfer, Mohr, Serological and OstwaldFolin Pipettes—and new Long Tip, Large Orifice and Automatic Pipettes.
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Full-circle main graduations. Continuous intermediate lines for easy reading, less parallax. Sharp, permanent markings. WRITE FOR FREE, 234-PAGE CATALOG describing Volumetric Ware and all 11,000 technical glassware items. Use your letterhead. KONTES PIPETTE TOLERANCES
MOHR AMD SEROLOGICAL PIPETTES - LABORATORY GRADE MOHR PIPETTES - PRECISION GRADE TRANSFER PIPETTES - PRECISION GRADE
fundamentals, industrial applications, methods of control, and economy of incorporating the procedure in manufacturing cycles. The book is divided into sections on principles of magnetoscopy, examples of applications and apparatus, demagnetization, economic considerations, and a bibliography of 151 references. Numerous illustrations accompany the text. Hochfrequenztitration. Kurt Cruse and Reinhard Huber. xii + 198 pages. Verlag Chemie, Weinheim/ Bergstr., Schliessfach 149, Germany. 1957. Kart. DM 22. This monograph sets forth the theory and principles of high frequency titrations. The significance of this method as applied to chemical analysis is described, and techniques for measurement and instrument usage are included. The booklet contains 152 illustrations, an extensive list of literature references, and a subject index. Chemische und biologische Laboratorien. Werner Schramm. 250 pages. Verlag Chemie, Weinheim/ Bergstr., Germany. 1957. DM 50. Many of the problems met in planning, constructing, and arranging chemical and biological laboratories are anticipated and answered in this volume. The book is fully illustrated with photographs, diagrams, and sketches. Some advertising is found in the back of the book, accompanied by indexes of advertisers and advertised products. A helpful list of reference books is also included. The subject index completes the wealth of material contained in this book. Lecture Notes on the Use of the Microscope. 2nd ed. R. Barer.
Kontes Pipettes are calibrated with extreme care. Tips are gradually tapered for correct orifice dimensions and effluent time for each size. Extreme tip is finely ground at right angles to pipette center line, then beveled. Durable borosilicate glass is used.
CAPACITY IN m l .
KONTES GLASS COMPANY First Choice For Quality In Technical Glassware V i n e l a n d , N e w Jersey Midwest Distributor: Research Apparatus, Inc., Cary, III. The precise calibration of the pipette shown here symbolizes the craftsmanlike approach Kontes takes in every phase of technical glassware manufacturing. For further information, circle number 60 A on Readers' Service Card, page 103 A 6 0
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ANALYTICAL CHEMISTRY
viii + 76 pages. Blackwell Scientific Publications Ltd., 24-25 Broad St., Oxford, England. 1957. $1.50. This 2nd edition is a revision of the first, limiting its changes to the correction of some minor errors and clarification of certain points. Intended primarily for beginners, the book is a concise scientific introduction to the use of the microscope. Emphasis -is placed on practical instructions; however, a short section on theory based on modern views is included. The author has dwelt on fundamental principles to the exclusion of specialized modern methods which he considers would only confuse the beginning student.
