1921] TUTTLE—RESERVE FOOD 149 
Ribes and Cornus, which were found to contain minute quantities, 
whereas all showed a relatively high oil and fat content. The 
winter buds of the same trees showed a high percentage of starch 
at this time. It would seem that the starch had either been con- 
verted in the mature leaves before leaf fall or else translocated to 
other regions of the plant. Table II records the leaf material 
tested. 
TABLE II 
MATERIAL Foop RESERVE 
Symphoricarpos sp. Oe ee 
vo gga at accidentilis fa os See ae 
Ribes sp. . eee Se oe US en tates 
Ribes Seinen CORA OG ee ee OF See 
Betula ssbioondiita Pig wee eae we 2 OR al Tats 
Rubus sp. cn tere ae Ag and fats 
Corylus rieteadis Dalen Awe ee nen er sO Ue ee 
IMMER. oS i Ke a a ss Oe 
Corydalis sp... oy aa ee ea se 
Ledum groenlandicum a eee yA oe ee a 
Arctostaphylos Cvacuiat Die bis oy | Se oe ee 
Vaccinium Vitis-Idaea . . . . . - .» « Oils and fats 
Syringes valgusig © Sa 8 eee ct tare 
Cornus stoloniferé <3. ox A oe Oe oo 
Several species of Salicaceae and Ericaceae were examined from 
high elevations in the mountains of Alberta and British Columbia, 
with a view to determining any difference in food reserve due to 
the different habitat. Herbarium specimens were used for the 
tests as fresh material was not obtainable. As these had been 
quickly and carefully dried, there is no reason to suppose that 
the starch or fat content of the cells would have been affected. 
Material of the stem was softened in water and tested immedi- 
ately. Very definite reactions were obtained. Most of the 
material had been collected at the height of the vegetative sea- 
son for the elevations at which it occurred. It was not possible 
to establish any connection between high elevation and a differ- 
ence of food reserve. The majority of the species examined 
showed the presence of both starch and oil during the vegetative 
season, although a few contained only oil, as shown in table III. 
