CELL-CONTENTS AND FORMS OF CELLS. 197 



Abrin, occurring in the seeds of Abrus precatorius; Curcin, in the 

 seeds of Jatropha directs; Crotin, in the seeds of Croton Eluteria; 

 and Robin, in the bark of Robinia Pseudo-Acacia. The pollen 

 of rye is also said to contain a toxalbumin, which, when adminis- 

 tered in extremely small doses, accentuates the symptoms of hay 

 fever in patients afflicted with this disease. Under the name of 



FIG. 112. Phyto-globulins (crystalloids) from several sources: I, a, b, from the 

 white potato; II, a to f, from the seeds of castor oil plant (Ricinus cotnmunis) ; in 

 b and b are shown different views of the same crystal; III, a to i, from the seeds 

 of the Brazil nut (Bertliolletia excelsa). After Dippel in "Das Mikroskop." 



"Vegetable Agglutinins" have been brought those protein sub- 

 stances which when added to a suspension of blood-corpuscles 

 rapidly cause them to agglutinate. Those substances that pos- 

 sess the same properties but are not poisonous are known as 

 "Phasins." (Consult 'The Vegetable Proteins," by Osborne; 

 and "Beitrage zur Kenntnis der vegetabilischen Hamagglu- 

 tinine," by R. Robert.) 



