1892.] 



THE MICROSCOPE. 



231 



find yourself in it, casting about for some special line of study, I 

 would advise you by all means to settle on the Radiolarla, and 

 work at them thoroughly. First, because they are so easy to pre- 

 pare, and, secondly, because I know they will amply repay all 

 the labor you may put upon them. 



List of Figures in the Plates. 



Fig. 



1. Stylosphara Carduus. FiG. 13, 



2. Hymeniastrum (Histiastrum) terna- 14. 



rium. 15. 



3. Stylocyclia dimidiata. 16 

 4 Sethampora (Eucyrtidium) Mongol- 17, 



fieri. t8. 



5. Cornutella ampliata. 19. 



6. Eucyrtidium Picas. 20. 



7. Lithornithium foveolatum. " 21. 



8. Lithocircus (Stephanolithis) spines- 22. 



cens. 23. 



9. Stauractura (Astromma) Aristotelis. 24. 



10. Spongosphaera rhabdostyla. 25. 



11. Halicalyptra Galea. 26. 



12. Pterocodon Campana. | 



[the end.] 



Ceratospyris Echinus. 

 Thj'rsocyrtis Rhizodon. 

 Periphaena decora. 

 Lophophsena Capito. 

 Dictyophimus Craticula. 

 Lychnocanium Tripodium. 

 Lithomelissa macroptera. 

 Calocyclas Turris. 

 Anthocyrtium (Anthocyrtis) Ficus. 

 Lithopera Lagena. 

 Lithochytris Tripodium. 

 Petalospyris Flabellum. 

 Botryocyrtis (Lithobotris) cribosa? 

 Stephanolithis (Lithocircus) annu- 

 laris. 



-i^J^^^" 



VvAVS 



AND MEANS 



A Microtome for 50 cents.— Dr. Hinz has described his 

 instrument in the Omaha Clinic. The main body is a tin pot 

 3 inches high by 8 in diameter. A bridge 3 inches wide crosses 

 the top (or open end of the can) and is soldered to the sides of 

 the pot. In its centre is an opening which is the termination of 

 the well, and around the well opening is a glass ring over which 

 the knife is to glide. The space around the well can be filled 

 with ice for freezing. Connected with the well he has a millett 

 screw four inches long and with 40 threads to the inch. One 

 revolution produces a section i-40th inch thick ; one-half revolu- 

 tion, a section i-Soth inch, etc. An amputating knife or razor 

 can be used to cut the sections. 



Study of Compound Eyes of Annelids. — Mr. E. A. Ai 

 drews macerated the eyes of annelids in Bela Haller's liquid, \\. 

 potassium bichromate, and in sea-water containing a small amount 

 of sulphuric acid; the last method was found very useful. The 

 staining reagents used were Mayer's acid carmine, Czokor's cochi- 

 neal, and methyl-green. Sections were stained with Kleinen- 

 burg's haematoxylin, and Grenadier's fluid was used for depig- 

 mentation. — youi-Jial of Morphology^ l8gi. 



