NOTES ON KECENT RESEARCH. 



899 



In the third generation each was nearly true to type, and it remained 

 nearly true to type." 



Finally, Prof. Hays gives further interesting details of the methods 

 of improvement by breeding and selection of " Corn " (Maize), Timothy 

 (Phleum), Potatos, Apples, Walnuts, and Flax, the special details of 

 which are perhaps more suitable for America than Europe, though the 

 general principles followed are the same for all, as quoted above in regard 

 to Wheat. 



This brings us to the end of a most valuable paper consisting of 

 seventy-two well-printed pages, with six excellent photograph plates, and 

 twenty-one text figures and diagrams. This paper once more illustrates 

 the practical genius of the American people, who, possessing a full know- 

 ledge of modern scientific researches and theories, and careful recorders 

 and experimenters themselves , yet concentrate their whole energies on 

 practical results. — G. G. H. 



Leaf Points. 



Precursor Point," The, in some Monocotyledons. By K. Goebel 



(Flora, Ixxxviii. 1901, pp. 470-2 ; 2 cuts). — The leaf of several Endogens, 

 such as Doryantlics Palmeri, ends in a conical point, circular or triangular 

 in section above, but opening out below into the flat leaf-blade, and wither- 

 ing when the leaf expands. It is rich in intercellular spaces and bears 

 stomata. It serves to close the apex of the bud, while helping respiration. 

 The organ occurs in the common ' Arum Lily ' (Richardia africana, syn. 

 Zantedeschia cethiopica, Galla cethioinca). — M. H. 



CORN-IIUST. 



Rust of Corn (" Beitrage zur Kenntniss der Grasroste "). Fritz 

 Miiller, aus Kreuzburg in Schlesien (Belli. Bot. Gent. bd. x. ht. 4, 5, 

 pp. 181-212, 2 figs.). — The paper contains records of an enormous 

 number of infection experiments carried out with Puccinia dispersa and 

 P. graminis. The most important results are as follows : — 



Puccinia dispersa, Eriksson, shows three special forms : 



(a) Special form Secalis with aecidia on Anchusa officinalis and 

 A. arvensis. Teleutospores on Secale. 



(b) P. Symphyti-Bromorum with aecidia on Symphytum officinale 

 and Pulmonaria montana. Teleutospores on Bromus spp. (perhaps sp. 

 form Bromi of Eriksson). 



(c) P. dispersa. yEcidia unknown. 



Of Puccinia graminis the author records both the special forms 

 Agrostidis and Avenae of Eriksson and nine other special races found 

 respectively on Triticum glauciim, T. caninum, Secale cereale, Poa 

 nemoralis, Festuca pratensis, Apera Spica-venti, . Lasiagrostis Galama- 

 grostis, Festuca ovina, and Agrostis alba. 



By numerous experiments each of these special forms was found to be 

 unable to attack a whole series of other Grasses. There are also numerous 

 tables, and full details of the experiments. — G. F. S.-E. 



The Development of Seeds. 

 Seeds, Researches on the Development of. By Frederick H. 



Billings {Flora, vol. Ixxxviii. 1901, pp. 258-318; 101 cuts). — The author 



T 2 



