ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 1069 



Spencer Objectives and Quekett. 



[Various letters as to the omission from the 2nd ed. of Quekett's ' Treatise 

 on the Use of the Microscope ' of the reference to Spencer's objectives 

 inserted in the 1st.] 



Amer. Mm. Micr. Joum., VII. (1S8G) pp. 197, 198. 

 T u R s i n i. — Apparecchio microfotografico. (Photo-micrographic apparatus.) 



[Supra, p. 1000.] II Morgagni, 1886, p. 90. 



Tykgel l, P. — A 1/25 in. Objective. 



[Commendation of a Spencer 1/25 in., balsam angle 125°.] 



Amer. Mm. Micr. Joum., VII. (1886) pp. 178-9. 

 Unna, P. G. — Zur Histotechnik — Zerstreuende Diaphragmen. (On Histo- 

 technique. Dispersing Diaphragms.) 



[Suggests for use with artificial light a ground-glass plate in the diaphragm- 

 carrier. Dr. W. J. Behrens adds in a note (Zeitschr. f. Wiss. Mikr., III., 

 1886, p. 230) that he prefers to use discs of dead blue cobalt glass, 2 mm. 

 thick, ground on one side, placed with the ground side up, and illuminated 

 with the concave mirror.] 



Monatschr.f. prakt. Dermatol., V. (1886) No. 4. 

 Van Allen, J. F. C— 200,000 to the Inch. 



[" Many dispute the possibility of resolving lines ruled so finely as 200,000 

 to the inch. I can only say I have broken this reputable law repeatedly, 

 and so have a dozen other reliable gentlemen " !] 



Micr. Bulletin (Queen's) III. (1S86) pp. 39-40. 

 Ward, H. M. — The Morphology and Physiology of an Aquatic Myxomycete. 



[Contains a description, p. 73, of a moist chamber formed out of thick 

 cardboard or several thicknesses of filter paper kept wet, a drop being 

 suspended in a central cavity from the under side of a cover-glass. Also 

 of the apparatus, supra, p. 10.Y7.] 



Stud. Biol. Laborat. Owens College, I. (1886) pp. 64-86 (2 pis.). 

 West i en, H. — Doppel Objectiv-linsen mit gemeinschaftlichen Sehfelde. 

 (Double objective lenses with common field of view.) 



Title of German Patent, Kl. 42, No. 4191. 

 White, T. C. — On a simple method of Photographing Biological Subjects. 

 [Post] 

 Sep. repr. from Jvum. Brit. Dental Assoc., 1886, October, 8 pp. and 1 fig. 



p. Collecting-, Mounting and. Examining Objects, &c* 



Cytodieresis of the Egg.f — M. J. B. Carnoy's paper on this subject 

 is divisible into tbree sections, tbe germinal vesicle, the first jjolar 

 globule, and the second jiolar globule, and accordingly the methods 

 of examination fall under two beads. 



In the study of tbe germinal vesicle and tbe nucleolus, the two 

 following methods were employed — (1) Methyl-green in combination 

 with 2 to 3 per cent, acetic acid, if possible on fresh objects, or on 

 objects which had been fixed by a reagent which neither deteriorates 

 the effect of the staining medium nor the constitution of the nuclein 

 elements. (2) The use of solvents for tbe nuclein and also for the albu- 

 men corpuscles. Metbyl-green is a specific reagent for the nuclein of 

 the nucleus for the following reasons : metbyl-green only stains tho 



* This subdivision contains (1) Collecting Objects; (2) Preparing, (a) in 

 general, (6) special objects ; (3) Separate processes prior to making sections ; 

 (4) Cutting, including Imbedding and Microtomes; (5) Staining and Injecting ; 

 (6) Mounting, including preservative fluids, cells, slides, and cabinets ; (7) Ex- 

 amining objects, including Testing ; (8) Miscellaneous matters. 



t 'La Cellule,' ii. (1886) p. 76 (4 pis.). Cf. Zeitschr. f. Wiss. Mikr., iii. 

 (1886) pp. 244-6. 



