Oct., i9M-Mar., 191S lUusfrations XI 



Page. 

 PlATE LXII. Ends of main stalks of two plants of Dale Egyptian cotton, show- 

 ing simple fruiting branches and closely similar axillary fruiting branches. 400 



Air and Wind Dissemination op Ascospores op the Chestnut- 

 BuGHT Fungus 



Plate LXIII. Fig. i. — Petri-dish culture 5044 from 12 minutes' exposure of 

 chestnut-bark agar, made on September 20, 1913, 2 hours and 8 min- 

 utes after the cessation of a rain, at station 51, located 27 feet from 

 the nearest lesion. Fig. 2. — Petri-dish culture 5041 from 16 minutes' 

 exposure of chestnut-bark agar, made on September 20, 1913, i hour and 55 

 minutes after the cessation of a rain, at station 49, located 414 feet from 

 the sotu'ce of the spores 526 



Plate LXIV. Fig. i. — Ascospore trap 51. This consists of a wooden bracket 

 which supports an object slide over perithecial pustules. Fig. 2. — 

 Ascospore trap 52. Fig. 3. — Water spore trap located at Station V 526 



Plate LXV. Fig. i. — View looking toward the coppice growth from water 

 spore-trap Station V. Fig. 2. — View of a mixed chestnut and oak grove 

 taken from water spore-trap Station VI 526 



TEXT FIGURES 



Relative Water Requirement op Plants 



Fig. I. Evaporation from a free-water surface (tank) at Akron, Colo., in 1911 



and 1912 8 



A Fungous Disease op Hemp 



Fig. I. Microscopic characters of the hemp fungus Botryosphaeria marconii. 

 A, Sketch of a section of stroma from culture, showing developing 

 perithecia: a, microconidial stage, b, ascosporic stage. B, An ascus 

 with ascospores. C, Ascospores. D, Macroconidia. £, Conidiophores 

 of the Dendrophoma stage. F, Microconidia 82 



Natural Revegetation of Range Lands Based upon Growth 

 Requirements and Life History of the Vegetation 



Fig. i. Curve showing the variation in the mean temperature in the Transition, 



Canadian, and Hudsonian grazing zones in 1909 98 



2. Diagram showing the total precipitation in the Transition, Canadian, 



and Hudsonian grazing zones during July, August, and September, 

 1909, inclusive 99 



3. Curve showing the comparative daily evaporation in the Transition, 



Canadian, and Hudsonian zones in 1909 100 



4. Curve showing the maximum and minimum temperature records in the 



Hudsonian zone (whitebark-pine association) no 



5. Chart of permanent and denuded quadrats i and 2 in station 4, es- 



tablished on July 3, 1907 122 



6. Chart of permanent and denuded quadrats i and 2 in station 4, remapped 



on July 12, 1909 123 



Pecan Rosette 



Fig. I. Map showing the known distribution of pecan rosette in the United 



States 149 



