46 



HISTOLOGIC PROPEETIES AND REACTIONS. 



phide, sodium hydroxide, sodium sulphide, calcium ni- 

 trate, uranium nitrate, strontium nitrate, cobalt nitrate, 

 copper nitrate, cupric chloride, barium chloride, and mer- 

 curic chloride. 



(5) In the hybrid, H. dcrones-zephyr, the very high 

 reactions with polarization and sulphuric acid ; the high 

 with chromic acid, pyrogallic acid, and sodium salicylate ; 

 the moderate with iodine, gentian violet, and saf ranin ; 

 the low with temperature, nitric acid, hydrochloric acid, 

 potassium hydroxide, and potassium sulphocyanate ; and 

 the very low with chloral hydrate, potassium iodide, po- 

 tassium sulphide, sodium hydroxide, sodium sulphide, 

 calcium nitrate, uranium nitrate, strontium nitrate, 

 cobalt nitrate, copper nitrate, cupric chloride, barium 

 chloride, and mercuric chloride. 



The following is a summary of the reaction intensi- 

 ties : 



NOTES ON THE HlPPEASTRUMS. 



The hippeastrums exhibit properties in general so 

 closely alike as to suggest very closely related plants, 

 such as in fact they are. In histological properties while 

 all possess in common certain fundamental generic char- 

 acters, each has certain individualities that are mani- 

 fested in variable ways. Each hybrid is more closely 

 related in certain histological features to one parent and 

 in certain others to the other parent, but the directions of 

 these variations may be the same or different in the dif- 

 ferent hybrids. Thus, in form H. titan-deonia is closer 

 to the seed parent than to the pollen parent, while in 

 H. ossulian-pyrrlia the relationship is closer to the pollen 

 parent; in hilum two of the hybrids are closer to the 

 seed parent and one closer to the pollen parent; in 

 lamellae in one hybrid in characters they are nearer the 

 pollen parent, but in number the same as both parents, 

 in another hybrid the number is the same as in the seed 

 parent but in the characters closer to those of the pollen 

 parent, and in the third hybrid characters and number 

 are closer to seed parent ; and in size one hybrid is more 

 closely related to the seed parent, another to the pollen 

 parent, and another in the larger grains to the pollen 

 parent. The hybrid modifications are associated with 

 inherent peculiarities of the parents, and inasmuch as 

 the parents of the three sets differ the hybrids differ, 

 and in fact they differ as much from each other as do 

 the parents. 



The uniformity or close correspondence in the courses 

 of the velocity-reaction curves in the case of each reagent 

 associated with a corresponding uniformity of the com- 

 posite reaction curves affords striking evidence of the 

 accuracy of the method employed in the recognition of 

 plant relationships. In a word, there is a hippeastrum 

 curve, which curve is modified in relation to each plant 

 represented. 



The parental relationships of the hybrids in the 

 various Teactions are as variable as those indicated in 

 the histological peculiarities. Each of the hybrids may 

 be in some of the reactions the same as the seed parent, 

 in others the same as the pollen parent or as both parents, 

 in others intermediate, and in others higher or lower than 

 either parent. Intermediateness is far from being the 

 rule, since in only 13 out of 78 reactions was intermedi- 

 ateness recorded, and in only 6 was there mid-inter- 

 mediateness. In fact, reactivity of the hybrid in excess 



