Oct. 4, 1915-Mar. 



Illustrations xvil 



An Asiatic Species op Gymnosporangium Established in Oregon 



Page 

 Plate LXXVIII. Fig. i. — iEcial stage of Gymnosporangium koreaetise on under 

 surface of leaf of Pyrus sinetisis. Fig. 2.— Telial stage of G. koreaense on 

 young twigs of Juniperus ckinenns; sori not distended. Fig. 3. — Same as 



figure 2 , with sori distended loio 



Plate LXXIX. Fig. i. — Gymnosporangium koreaense on leaves, petioles, and 



stems of Pyrus sinensis. Fig. 2. — G. koreaense on Cydonia vulgaris loio 



Relation of Stomatal Movement to Infection by Cercospora 



beticola 



Plate LXXX. Fig. i. — Stomatoscope designed by Dr. F. E. Lloyd and used 

 for a part of these studies. Fig. 2. — Humidity box in place over plants in 

 the greenhouse for maintaining different relative humidities; also a cog 

 psychrometer used for checking hygrothermographs kept among the sugar- 

 beet plants 1038 



Plate LXXXI. Cercospora beticola Sacc: Conidia germinating on a sugar-beet 



leaf, with germ tubes entering open stomata 1038 



A New Penetration Needle for Use in Testing Bituminous 

 Materials 



Plate LXXXI I. Fig. i. — Direct enlargement of a package of No. 2 sewing 

 needles, showing the variations in shape. Fig. 2. — Direct enlargement of 

 penetration needles, showing the comparison between two standard needles 

 and seven needles of the new type prepared by the writers 1126 



Relation of Green Manures to the Failure of Certain Seed- 

 lings 



Plate I/XXXIII. Cotton seedlings, showing the effect of green manures on 

 their growth: Fig. i. — Effect of different kinds of green manures added 

 to the soil. Fig. 2. — Effect of planting immediately after plowing under 

 green manure. Fig. 3. — Effect of planting 2 weeks after plowing under 

 green maniu-e. Fig. 4. — Effect of the depth of green manure on germina- 

 tion. Fig. 5. — Effect of sterilized and unsterilized oats used as a green 

 manure. Fig. 6.^Effect of Rhizoctonia sp. on germination in the pres- 

 ence of green manure 1176 



Plate LXXXIV. Clover, flax, and cotton seedlings, showing the relation 

 of green manures to germination in sterilized and unsterilized soil: 

 Fig. I, 2.— Clover, Fig. 3, 4.— Flax. Fig. 5, 6.— Cotton 1176 



A New Spray Nozzle 



Plate LXXXV. The beginning of the spray from three kinds of nozzles, as 



photographed with a moving-picture camera 1182 



Plate LXXXVI. Fig. i. — The appearance of spray from three kinds of nozzles 

 as full pressure is applied (a continuation of Plate LXXXV). Fig. 2. — Two 



stages at the end of the spray as the pressure is reduced 1182 



27468° — 16 2 



