PLATE 6. Confervoidese. Crystals. 



Figure 



1. Cosmarium margaritiferum y Turp. ; conjugating pair with imperfect sporange. 



2. C. Botrytis, Bory ; conjugating pair with sporange, enveloped in jelly. 



3. A. Closterium acerosum, Schrank. a, 5, c, different stages of conjugation 



d, frustules apparently produced from a sporange. 



3. B. Closterium Lunula, Mull.; the contents converted into globular bodies. 



4. Fragilaria penicillata, Lyngb. a and b> successive stages of conjugation. 



5. A. Surirella bifrons, Ehr. ; conjugating pair, with intermediate large nev 



frustule. 



5. B. Surirella bifrons, Ehr., with the contents converted into globular bodies. 



6. Eunotia turgida, Ehr. a, b, c, d, e, successive stages of conjugation producinj 



pairs of new frustules. 



7. Melosira (Aulacosira) crenulata, Thw. a, filament with two conjugating pair 



of cells and perfect sporangial frustules ; b and c, large filaments produce< 

 by sporangial frustules. 



8. Melosira varians, Ag. a, small filament producing sporangial frustules by con 



jugation ; b, large filament developed from sporangial frustules. 



9. Orthosira Dickiei, Thw. Successive stages of production of sporangial frustule 



after conjugation. 



10. Pinnularia viridis, W. Sm., with the contents converted into globular bodies. 



11. Pediastrum granulatum, Ktz. , a frond with most of the cells empty, thre 



full, and the contents of another swarming out as zoospores ; b, c, d, swarm o 

 zoospores producing a new frond. 



12. Crystals of sugar of milk. 



13. diabetic sugar. 



14. indigo, sublimed. 



15. oxalate of soda. 



16. sulphate of lime. 



17. phosphate of lime. 



18. sulphate of strontia. 

 1*. allantoin. 



2*. antimoniate of soda. 



3*. protoxide of antimony. 



4*. butyrate of baryta, a, rapidly, b, slowly formed. 



5*. hydrofluosilicate of baryta. 



6*. sulphate of baryta, a, precipitated from concentrated, b, from ver 



dilute solution. 



7*. carbonate of potash. 



