240 FOEESTRY [Bot. Absts., Vol. VII, 



1633. Farwell, Oliver A. Notes on the Michigan Flora, II. Michigan Acad. Sci. Ann. 

 Rept. 21: 345-371. 1919.— See Bot. Absts. 7, Entry 487. 



1634. GiBBS, Vic ART. Oaks at Aldenham. Jour. Roy. Hort. Soc. 45: 155-233. Fig. 

 15-26. 1919. — 'A popular article giving the characteristics and behavior of over 75 species of 

 Quercus, including some hybrids and varieties, brought from Asia, America, and continental 

 Europe. Nearly all the types described are growing on the grounds of the author. It was 

 found that trees from the nursery row grew especially well when planted in leaf mould under- 

 laid with a thick bed of forest leaves. — •/. K. Shaw. 



1635. Grabham, Michael. The cluster pine. Nature 105:675-676. 1920.^ Pinus 

 pinaster was probably introduced into Madeira about 1770, and for general purposes is the 

 most serviceable conifer yet seen in Madeira. Seed is sown in November or December v/ith 

 wheat, and yields stakes in 4 or 5 years and firewood in 12 or 15. The species does not sprout 

 from the stump. Reference is made to some other conifers in Madeira. — 0. A. Stevens. 



1636. Haines, H. H. Indian species of Carissa. Indian Forester 45 : 375-388. PI. 17-20. 

 7 fig. 1919.— See Bot. Absts. 7, Entry 520. 



1637. Hall, Guthbert. On a new species or form of Eucalyptus. Proc. Linnean Soc. 

 New South Wales 43: 747-749. PI. 75. 1918.— See Bot. Absts. 7, Entry 521. 



1638. Hauch, L. a. Proveniensforsog med Eg. II. [Tests of climatic varieties of oak.] 

 Forst. Forsogsv. Danmark 5: 195-224. PI. 6. 1920.— Twelve experimental plantations have 

 been made with oaks from Denmark, Holland, Russia, Moravia, Hungary, Slavonia, South 

 Austria, and Hanover. These were started in 1909. The results to date show that none of 

 the introduced varieties can be used with absolute certainty and that the oaks of Danish 

 origin are best suited for local use. The oaks from native seed are more robust and vigorous 

 than those of foreign origin, their manner and time of development render them less liable to 

 attack by mildew; the non-native oaks are generally more straight than the Danish varietj^; 

 they develop more summer shoots which are long and slender and with diminutive buds 

 strongly infected with mildew; often they do not ripen at all and are therefore less frost 

 hardy. Leaves of the Danish oaks develop later in the spring and discolor earlier in the 

 fall. — ■/. A. Larsen. 



1639. Heinricher, E. Ein Versuch Samen, allenfalls Pflanzen, aus der Kreuzung einer 

 Laubholzmistel mit der Tannenmistel zu gewinnen. [An attempt to secure seeds, perhaps 

 plants, from the cross between the mistletoe of deciduous trees with that of the Coniferae.] 

 Ber. Deutsch. Bot. Ges. 37: 392-398. Dec, 1919. 



1640. Helms, Johs., og Paul Wegge. Prikleforsog paa Silkeborg og Vemmetofte Skov- 

 distrikter. [Transplanting tests at Silkeborg and Vemmetofte forests.] Forst. Forsogsv. 

 Danmark 5: 225-292. PI. 41. 1920. — Experiments in grading and pruning transplant stock of 

 Abies normandica and Picea excelsa were carried out from 1915 to 1917. The large plants of 

 spruce resist drought better than do the medium-sized ones and these in turn better than the 

 smallest ones. Unpruned stock always gives the largest percentage of usable plants. Dif- 

 ferences in survival of the grades are less marked in favorable than in dry seasons. Light 

 root pruning produces practically no difference in a favorable season, but may result in much 

 loss of pruned stock in a dry summer and may result in poor growth. If the second season is 

 moist the tops develop most, whereas the root growth is proportionately larger in a dry season. 

 Vigorous tamping of the soil after transplanting is useless. The third (smallest) class of seed- 

 lings should be discarded. Stock will stand more pruning on clay soil than on sandy soil, — • 

 on the latter only the long straggling roots should be cut. — J. A. Larsen. 



1641. Holten, a. To-aarig opbevaring af agern. [Storing acorns two years.] Dansk 

 Skovforenings Tidsskr. 5: 191-198. 1920.— A considerable quantity of acorns which had 

 been stored in the fall of 1918 gave 40 per cent germination in 1920. The author concludes 



