m 











I 







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526 



MB. S. LE M. MOOBE's STUDIES 



h 







< 





which mention is made of an examination of Apiocystis, so that 

 the alga would appear to occur also in France. Professor Bower 

 tells me that he found Apiocystis while working, some years ago, 

 in the late Professor de Bary's Laboratory at Strassburg. Other 



(Wt 



ding to Mr, A. W. Bennett in Journ. Bov. Micros 











. 













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1890. 



Mr. West in Journ. B. Micros 



Professor Hansgirg's memoir u Ueber den Polymorphism us der 

 Algen " (Bot. Centralbl. Band xxii. p. 200) was overlooked by me. 

 Hansgirg imagines a number of algal types, including such ap- 

 parently distinct ones as Nephrocytium, Oocystis, Dictyosph&ria, 

 Characiutn, Hydrianum, &c, to be mere pleomorphic forms of 

 various Chatoplioracece, Siplionocladiacece, TJlvacete, &c. He is 

 unfortunate in including Apiocystis in this list; and one can 

 scarcely suppose that even careful research will confirm all this 



botanist's ideas. 



JK] 













EXPLANATION OF PLATE XIV. 









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f' 



























Fig. 1. Vegetable-Marrow. Sieve-tubes and companion cells : xanthoproteic 







2. 



reaction (reaction of wall not shown). 

 Ditto. Millon's reagent. X 450. 



X450. 



3. Ditto. Copper Sulphate and Caustic Potash (the dirty-pink colour). 



X450. 



4. 



Ballia callitricha, Ag. 

 5. Ditto. 



Millon's reagent. X 450. 







Xanthoproteic reaction. X 450. 



6. Ditto. Copper Sulphate and Caustic Potash. 



7. Ditto. Stoppers after 30 hours' action of the peptonizing fluid. Pit and 



connecting-protoplasm well seen. (Drawn with mag. of 600 diam. 

 and enlarged.) 

 Ditto. Shows effect of boiling for one minute with Millon's fluid. The 

 colour has flown and granular precipitation is visible in the stoppers ; 



protoplasmic reticulum still visible, 

 tt. Ditto. 



8. 



X600. 



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Shows action of Schulze's macerating fluid: (a) the stoppers 

 have melted into the two balls of plasma which still remain at the pit's 

 mouths ; (b) plasma separated from pit, showing the latter quite empty. 

 X 450. 



10. Vegetable-Marrow, Effect of a peptonizing fluid : the sieves are quite 



clear, and no trace of callus is visible. X 450. 



11. Macrocystis pyrifera, Ag. Callus upon sieve -plate of a sieve-tube : xan- 

 thoproteic reaction, x 600. 



Effect of Millon's reagent upon callus of sieve-tube. X 450. 



















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