VOL.3. No. 12 CLASSIFICATION m~SEGREGATION IN ANALYTICAI. CHEMISTRY 1407
TABLE V CLA€SIFICAT~ON CO~~&LATIONS Inorganic grades
Class
with semeder
Qualitative 1924-25.. ...................... Qualitative 1925-26. ....................... Quantitative 1924-25 ....................... Quantitative 1925-26 .......................
grades
0.56 0.39 0.52 0.47
Qual.
First exam. with semester
with semester
grades
grader
0.71 0.91 0.76 0.69
0.92 0.70
grades
.. ..
Segregation into sections of approximately equal ability for recitation and lecture purposes can be made from the classification rating with a fair degree of reliability, necessitating little or no subsequent redistribution. In the following table are summarized the data on sectioning for all four classes exclusive of withdrawals and the balanced section, giving the total number of students in each section whose semester grades fell between the limits indicated. TABLE VI Final sem-ter grades
Between W l W . . ........................... Between 80-89.. ............................ Between 70-79.. ............................ Between 60-69.. Below 60 ...................................
AT-re
Superior
sections
............................
seetima
10 41 33 5 0
0 15 36 43 13
Inferior
sections
0 0 15 32 28
The table shows that the grouping into sections, using the classification rating, has been in good agreement 'with the students' capabilities. Segregation has solved a number of teaching difficulties,increased the morale, and bettered the attitude of the student and probably lowered the mortality. Extracts from Brain Tissues Stop Bleeding. Dangerous bleeding after snrpical may now be stopped by chemical substances or accidental injury to blood -1s derived from brain, lung, blood, or other body tissues. Herbert Hamilton of Detroit described a t the last meeting of the American Chemid Society how substances of animal oriain which cause the blood to coagulate more quickly are made. Extracts . may be prepared from any tissues, Mr. Hamilton said, but those from the brains or lungs are the most effective. These substances are to be used by "bleeden," or bemopbiliacs, as the doctors call them. They are persons with blood which fails to coagulate quickly enough or which does not form the right kind of clots.Science Sewice Chemist Makes New Synthetic Resin. A new resin, made of glycerin and carbolic acid, and used in the making of varnishes, molding powder and other substances. was described before the American Chemical Society meeting in Philadelphia by James McIntosh, of Bridgeport, Pa., the discoverer. After the glycerin and carbolic acid have been condensed the product can be made into an infusible, insoluble substance by a one or two-step process. The reaction can be speeded up by the addition of a hardening agent. The new resin is called acro1ite.-Science Service ~
