NOTES, REVIEWS, ETC. 



tically all nucleus. The corpuscles on the other hand have lost their 

 nuclei wholly. Between these extremes we have various stages/ of 

 chromatin reduction in the development of the specialized Metaeoan 

 tissues. The maturation divisions in ova and sperm, the bodily ex- 

 trusion of chromatin observed on the part of blood-cells, etc/ he re- 

 gards as illustrations of the process. 



THE RESERVE OF FOOD IN TREES 



Proton and\Phillips (Forest Quart., 1911) agree 7 with the com- 

 mon view that staV'h is the principal form in which reserve food is 

 stored in trees. Tney doubt that cellulose is abl/to act at all as a 

 reserve material. Tie maximum contained re/erve for deciduous 

 trees occurs about theVime the leaves fall, and during the next few 

 weeks there is a decidedVeduction in its amount. The sugar content 

 in trees remains pretty constant <.-xri.pt f"r ,'m incn-a-r in -pring (lur- 

 ing the unfolding of the btn 



ALTERNATION OF ''. N M 





Lewis ( Mot. Gaz., Mch.. iQrs^. by artificial plantings of tetra- 

 spores and carj>ospores of Polysw1(pnia and some other genera of 

 red algae gets experimental re:/ilts\upporting the general conclu- 

 sion that tetrasporcs produce only the sexual plants and carpospores 

 only the tetrasporic plants. /In no instance was an exception found 

 to the rule, although a considerable numbet of plantings developed 

 to maturity. Tetrasporcs from a given individual produced male 

 and female plants in approximately equal numbers. It is also con- 

 cluded that no greater growth vigor comes to th\ carpospores over 

 the tetraspores because of the double number of chromosomes con- 

 tained by them. 



RELATION OF THE PROTOPLASM OF ADJACENT PROTOPLASTS 



iy (Ann. Bot.. 1911) undertakes to throw light ofa the rela- 

 tion that exists between protoplasms of contiguous cells, b\ an ex- 

 amination of the relation between the parasite, Cuscuta, and r^s host. 

 She finds that there is no direct protoplasmic connection between the 

 cells of Cuscuta and the host, but that the phloem cells of the pa^a- 

 site haustoria apply themselves to the sieve plates of the phloem of 



