124 THE MICEOSCOPE. [May, 



QUERIES AND ANSWERS. 



Questions of all sorts feinting to tnicroscopy will be received by the publisher and re/erred 

 to Dr. S. G. Shanks, of Albany, N. Y., whose replies ^uill be given in this department. Each 

 question is numbered /or future reference. 



I "J. Paste for Photographic Prints. What paste is used 

 that will not spoil or fade prints? — A. B . 



Use equal weights of pure starch and selected gum arable, 

 boiled with water to make a paste about the consistence of thin 

 molasses. This should be well worked into the back of the 

 moistened print before applying to the card mount. 



1 8. Crooksha?ik's Magejita Bacillus. Where can I find a 

 description of this bacillus? — P. B. 



Consult A Manual of Bacteriology, by Prof. E. Crookshank. 

 An English publication. 



19. Kid7iey Epitheleu?n. What was Heidenhaiji^ s experi- 

 ment to deniofistrate the secreting function of the kidiiey 

 epitheleum? — PI. A. B. 



Haifa drachm of a saturated solution of indigo-carmine was 

 slowly injected into the carotid artery of a small animal. About 

 half an hour afterwards the animal was killed and the kidney re- 

 moved. It was thus shown that the epitheleum of the tubules 

 separated the soluble matters and the glomeruli excreted water 

 only. 



20. I7nbeddi7ig in Celloidi?i. Whose 77iethod is best? 

 Minot's methed is one of the best. Consult Afn. Mo. Mic. 



Journal^ Vol. VH, page 229, for this method in full. Also 

 V^ol. IX, page 69. for a good paper. 



21. Iinbedding in Celloidin and Pyroxylin. Where can a 

 descriptio7t be foujid., and is it adva7itageous ? — C H. 



Celloidin and pyroxylin are practically the same. Celloidin 

 being rather finer in grain is undoubtedly better for microscopical 

 use. 



22. Imbedding or E7nbeddi7ig. Which is the correct term? 

 —E. K. 



" Imbedding" is the pro^^er word to use. 



23. Photography. Can so77ie reader reco77ime7id a practical 

 and useful text-book on general photography for an a77iateur? 

 —E. P. 



Will some of our experienced readers name such a book.^ 



