110 The Microscope. 



statoblast, bringing it into the genus Heteromyenia, Potts, Mr. Mills 

 names it Heteromyenia radiospiculata, N. Sp. 



Dr. Kellicott read a paper on " The Coloration of Native Waters 

 and the Causes." The most obvious analysis is as follows: 1. Inor- 

 ganic matters in suspension. 2. Inorganic matters in solution. 3. 

 Organic matters in suspension, and 4. In solution. Instances of the 

 first class are the Yellow River and Sea in China, due to particles of 

 loess. The azure of Lake Leman, due to rock material flowing from 

 beneath glaciers. Of the second class, few and rare instances of 

 colored mineral waters. Of the third class, these waters are suspicious, 

 and the color is due to peat or hemlock, very little organic life in 

 these waters on account of deficient aeration. Fourth class, color some- 

 times due to an algse, as in the Red Sea. In the Schliersee, in Bavaria, 

 color was first a bluish green, which turned yellow ; the green was 

 due to a Palmella, which was finally attacked and destroyed by the 

 peach-colored micrococcus Clatterocystis rosea persicuia. 



The fishy odor of the Boston water supply, some years ago, was 

 due in part to a minute algre, the Coelos pleaerimim kutzingimium, 

 which turns water a blue -green. Finally the doctor said he had 

 examined a water in the neighborhood of a decided green. In this 

 he found very few infusoria or desmids or algae of any kind. The 

 stain seemed to be due to a minute form presumably a bacterium. 

 "And," continued the Doctor, " when no other form can be found to 

 stand for the cause of phenomena or troubles, is it not the fashion to 

 assign the bacteria?" 



The Doctor thought he had indicated enough to show where 



work might be done in the fixture. 



Louis A. Bull, Secy. 



ELEMENTARY DEPARTMENT 



RUDIMENTS OF PRACTICAL EMBRYOLOGY.* 

 SECTION IL 



W. p. MANTON. 

 MATERIAL. 



§ 4. Whether the hen or an incubator be employed, the eggs 

 used must be newly-laid, in order that the stages of development 

 may be accurately studied. Before beginning incubation the date 

 and the hour at which this is to commence must be written on the shell 

 with ink — and, as the eggs are placed in the incubator, should lie 



♦Copyright. 



