284 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



From the Tables, it will be seen that I have tested the seed 

 of some American species from different localities, and the weights 

 in ounces per 1000 seeds are as follows : — 



Abies concolor, 

 , , rjrandis, 

 Pinus pondcrosa, 

 Pscudotsuya Douglasii, 



These figures are, as the Tables show, the average of several 

 samples tested during a series of years. The lowest figures for 

 fresh seed that I have found are for A. concolor 0'74, A. grandis 

 , 32, and P. Douglasii 0*33, and these ai'e all from Colorado seed. 

 As the glaucous varieties of A. concolor and Douglas fir from the 

 Rocky Mountains of Colorado appear to be much more hardy 

 (even if they are a little slower growing and smaller) than the 

 light green varieties from the Cascade Mountains near the Pacific 

 coast, it is most desirable that seed-tests should be capable of deter- 

 mining with certainty that the seed offered is the kind we want. 



The seed of Sitka spruce appears to show a similar marked 

 difference in the size of the grains. I have, for instance, in the 

 spring of 1900, had two lots from two different place3. That from 

 Mount Shasta in the northern Sierra Nevada in California, in 

 about 40° north latitude, weighed 0-10 oz., while that from the 

 Cascade Mountains in Washington Territory, in 48° of latitude, 

 weighed 0'16 oz. per 1000 fresh seeds. The average weight of 

 fourteen samples in twelve years has been 0*10 oz. 



The figures are, however, still too few for the American species, 

 so that they need not be taken for anything but an indication 

 of the direction in which I think my seed-testing in the near 

 future is likely to develop. 



The Seed op Deciduous Trees. 



There are much less positive results of tests with these, as 

 most of the species germinate too slowly, but still we have the 

 satisfaction to be able to get good results of germination-tests of 

 Alnus and Betula, and this even in a comparatively short time. 



1 This is the variety known as scopulorum, Eng. 



