218 



Unlvcrsil If of Californiit PuhVications i)) Botnny T^'oi,. 7 



T.\Bi,E 1. — The Kestlts ok a Numuek of T)rpr,TCATE Axat.yses 



Spccirs or v:iriot.\' 



157 Haplopapi)U.s ericoicliv 



20.'? C. n. Kiiaphalodes* 



2()(') Haplopappus nanus 



220 C. n. consimilis 



240 C. n. speciosus 



255 C. n. speciosus 



257 C. n. consimilis 



290 C II. pinifolius 



"■ 111 tliis and followiiio' 

 ('hnjHotha m nun na uscosiis. 



Place of Collection 



San Francisco, Calif. 

 San Francisco, Calif. 

 Koarsargo, Inyo Co., Calif. 

 KearsarKf, Inyo Co., Calif. 

 Near Benton, Calif. 

 Near Benton, Calif. 

 Near Wabuska, Nev. 

 Near Wabuska, Nev. 

 Near Weed, Calif. 

 Near Weed, Calif. 

 East of H;immett, Idaho 

 East of Haminett, Idaho 

 East of Hammett, Idaho 

 East of Hammett, Irlaho 

 East of Hammett, Idaho 

 East of Hammett, Idaho 

 East of Hammett, Idaho 

 Shoshone Falls, Idaho 

 Shoshone Falls, Idaho 

 Alamosa, Colo. 

 Alamosa, Colo, 

 Alamosa, Colo. 



tables tlic initial letters 



Date of .Acptoru' Honzonp 



Coljpction Kxtriict Extijirt 



1918 Per cent. Per cent. 



The reduction by maceration and grinding of woody plants for 

 detailed chemical analysis of the contents of their tissnes is at best 

 attended with some difficulty. The difficulties were somewhat mag- 

 nified in the material with which we worked, since the wood of most 

 species of ChrysothniiniHs is quite hard and since, also, it was necessary 

 in most cases to grind green shruh. 



Each plant to be analyzed was trimmed with care. Since it seemed 

 clear tliat for all jiractical purposes the older ])ortions of the main 

 stem contained maximum (juantities of rubber, all the younger shoots 

 and most of the root was eliminated previous to grinding. Figure 4 

 shows portions of a representative jilant of Chrijsothiunnus )i(iiisrosus 

 var. viriduJus trimmed in this way and ready for grinding. 



Usually such large plants were cut up into a number of e([uivaleiit 

 portions, alternate pieces being used for grinding. In s(mie cases 

 where the plants were unusually large the trimmed mass was split 

 longitudinally into portions as nearly equivalent as possible. In this 

 connection may be mentioned th(^ difficulty of {performing this opera- 

 tion successfully. It is evident that the including of "bark" belonging 



