IV 
CIRCULARS OF THE BUREAU OF PLANT INDUSTRY. 
Circular No. 4. — Tun Treatment op Damping-Off in* Coniferods Seedlings. 
Introduction 
Procedure in experiments 
Powders used 
Sulphur 
Dry Bordeaux mixture 
Copper sulphate and lime 
Solution!- used 
Potassium sulphid and permanganate 
Formalin 
Sulphuric acid 
Circular No. 5. — Barley Culture in the Northern Great Plains. 
Development of the industry 
Distinct barley districts 
Comparison of yields of different varieties in the northern Great Plains 
area 
Two-rowed compared with six-rowed barley 
Breeding better strains 
Maintaining pure seed 
Cultivation 
I fees of barley 
Circular No. 6. — The Cultivation and Handling of Goldenseal. 
Introduction 
Habitat and range of goldenseal 
Description of the plant 
Description of the rhizome, or rootstock 
Collection and preparation of the root 
Brief medical history 
Cultivation 
Necessary soil conditions 
Fertilizers 
Artificial shade 
Use of i rees as shade 
Attention required 
Method- of propagation 
Experiments with seeds 
Experiments with divided rhizomes 
Experiments with plants from fibrous roots 
Yield of roots 
Time necessary to mature the crop 
Hydrastin content of cultivated roots 
Market conditions 
Highest and lowest prices 
Ciri i i.\r No. 7. — The Field Treatment of Tobacco Root-Rot. 
Nature of root-rot 
Field treatment of root-rol 
Occurrence of root -rot 
I ield experiments show iiiL r the bad effects of alkaline commercial fertiliz- 
ers on root-rot soils 
( rreenhouse experiments \\ ith alkaline fertilizers 
Summary 
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