SPECIAL METHODS. 231 



represents such a grain in three different views, of plates 

 placed close together and themselves composed of concen- 

 tric rings. The whole grain therefore lacks a common cen- 

 tre of stratification. In other paramylum-grains Klebs was 

 able to bring out the stratification only by swelling media. 



The paramylum-grains differ chemically from the starch- 

 ; grains in not being colored by iodine solutions and in not 

 being stainable, in general. Klebs (I, 270) also gives it as 

 characteristic of them that they remain quite unchanged in 

 5# caustic potash and do not swell, while in even a 6% solu- 

 tion of the same they at once dissolve with strong swelling. 

 We have no more exact chemical analysis of these grains. 



e. Cellulin-grains. 



414. The cellulin-grains discovered by Pringsheim (I) in 

 the hyphae of various Saprolegniacece have sometimes the 

 form of round or polyhedral plates and are sometimes more 

 globular, and often show evident stratification (cf. Fig. 55). 

 They are not colored by iodine solutions, and 

 are even insoluble in concentrated caustic pot- 

 ash solution, but soluble in concentrated sul- 

 phuric acid and in a solution of zinc chloride. 

 Nothing is known of their chemical constitu- F 'c- 55- Ceiiuiin- 



grains of Lepto- 

 tlOn. ntitus lacteus. 



Weber van Bosse (I) discovered globular bod- heim - 

 ies which agree completely with cellulose in their reactions, 

 in one of the Phyllosiphonacece, Phytophysa Treubii. They 

 are not colored by a solution of iodine and iodide of potas- 

 sium, but are colored blue by iodine and sulphuric acid, an'd 

 violet by chloroiodide of zinc. 



f. Fibrosin-bodies. 



415. Zopf (III) found, in the conidia of Podosphcera Oxy- 

 acanthce and of other Erysiphea, characteristic bodies which 

 he calls fibrosin-bodies. They are always imbedded in the 

 cytoplasm and are sometimes cup-shaped, sometimes in the 



