730 Forestry Quarterly. 



A summary of the stem characteristics is as follows: 



Vessels more numerous, 14 X — 7 AI (i same) 



Vessels larger, 9 X — 11 M (2 same) 



Total area larger, 17 X — 5 M 



Walls of vessels heavier, 16 X — 4 M (2 same) 



Walls of fibers heavier, 14 X — 6 M (i same) 



Lumen of fibers smaller, 16 X — 2M (2 same) 



More growth rings, 10 X — 6M (3 same) 



More sclerenchyma and collenchyma, 15 X — 6 M (i same) 



Cork thicker, 9 X — 8 M ( i same) 



Comparative Anatomy of Dune Plants. Botanical Gazette. October, 

 1912. Pp. 265-305. 



Dr. Pittauer reports in a voluminous article 

 Light on the results of experiments in influencing 



and germination by dilTerent degrees of light 



Heat and extreme temperatures. The experi- 



in ments were made on a variety of conifers 



Germination. besides Beech and Black Locust. The 

 germination was carried on in a modifi- 

 cation of Jacobsen's apparatus which is illustrated. In testing 

 the effect of various stimuli, hot water, frost, heat, light are 

 utilized. 



Jacobsen's experience with P. strobus is cited, showing that in 

 a cold porch germination proceeded better than in a room tempera- 

 ture, the data being : 



30 60 70 100 130 days 

 Room, 2 9 14 18 22 per cent. 



Porch, o 3 39 69 73 per cent. 



Similar results were obtained by exposing the seed placed on 

 snow in a zink case in a north window to frost for several days. 

 It was found with this species that the highest germination in 

 the shortest time was secured, when the seed was first allowed to 

 freeze dry for four weeks, then for 24 hours soaked in room 

 temperature ; or was allowed to freeze on snow for 5 or 6 weeks ; 

 or was for 60 seconds scalded with boiling water, all in diffuse 

 light. 



