CONTENTS 11 



VOLUME B — GENEEAL SCIENCE page 



Introduction 17 



Effects of Fire — Staff Changes — Private Workers — Title of Laboratories — Second Review 

 Supplement — Volume B — Variety of Subjects — Ornithology — Arachnida — Protozoology — 

 Ancient Gold Mining — Ethnology — Anthropology — Tropical Sanitary Engineering — 

 Entomology — Chemistry — Soil Analyses — Calotropis jirocera — Library — Distinguished 

 Visitors — Scientific Staff'— Future of Scientific Work in the Sudan. 



PiEPOET OF THE CHEMICAL SECTION. By WiLLIAM BeaM 23 



Introduction — List of Analyses and Examinations — Scope of Work. 



A Test foe Ha.shi.sh — Details of Test — Variations of Method. 



Khartoum Water-supply — Notes — Physical Characters — Tables of Analyses — Improve- 

 ment in Storage — Corrosion of Pipes — Action on Lead. 



SoBAT KiVEE Water — SuitabUity for Irrigation Purj)Oses — Tables of Analyses. 



ilECHANiCAL An.alysis OF Aeid Soils — Various ilethods — Tables of Analyses — Centri- 

 fugal Method : Size of Clay Particles — Determination of the " Silt " — Classification of 

 Soil Particles — Resume of the Method Used. 



Soils of the Gezira — Xative Crops — Rainfall — Classes of Soil — Experimental Farm — 

 Effect of Baking — Chemical Composition — Tables of Mechanical Analyses — Tallies of 

 Chemical Analyses — Detailed Tables of Analyses. 



Gypsum as a Feetiliser of Sudan Soils — Lime in Soils — Fertiliser Experiments on 

 Cotton Soils — Effects of Ajiplication of Gypsum to Soils — Amount to be ajiplied. 



Gum Research — jNIierobial Origin — Tapping Experiments— Influence of Cold — Method — 

 Varieties of Iladidb Gum — Viscosity — Tapping of Talh Trees— Conclusions. 



Experiments on Gum Production in Kordofan. By E. S. Edie 73 



Investigations in Gum Gardens — Tables of Yields from Small Trees — Variations in Yields — 



Effects of Rain — Sizes of "tears" — Tables of Yields from Large Trees — JIaxinnnn and 



Minimum Temperatures — Best Time for Tapping — Viscosity and Acidity of Gum from 



Small and Large Trees — Methods of Determination — Effects of Treatment of llaahiih 



Trees on the Yield : Effects of Strong Antiseptics ; Table of Results — Bacterial Origin of 



Gum ; Transmission of Infection ; " Iir vitro " Experiments in Gum Production — Analysis 



of Resulting Bacterial Products — Laboratory Confirmation of Work in Gum Garden. 

 Peeliminaey Notes on the Chemistry of the Latex of Calotropis procera. By 



J. Thompson 85 



Native Uses of Ushar Plant — Investigations and Experiments — A Colour Reaction — Toxicity 



of the Latex — Experiments with Rabbits — Toxic Portion — Detection in Cases of Suspected 



Poisoning — Reactions of Foodstuffs — Reactions of Colour Reagents — General Analysis — 



Extraction with Various Solvents. 

 Report of the Entomological Section. By Harold H. Kinc; 95 



Introduction — Itinerary — Control of Locust.s — Plant Diseases Ordinance — New Blood- 

 sucking Flies — Collectors — Control of Moscpiitoes — Injurious Birds — Acknowledgments. 



Insects Injurious to Man and Animals — Mosquitoes — The Control of Mosquitoes — 

 Blood-sucking Flies other than Jlosquitoes : New Tabanids, List with Localities : 

 Chironomidci, SinmlidiP, Psi/chodkhe, Tahanido', Mnscidti', Hijypoltoicidfr — Cimicidw 

 QSstridre — Ticks — Synoptic Table of Sudanese Ticks. 



Animals Injurious to Farm and Garden Crops — Dura Stem-borer — Black or Greasy 

 Cutworm — Asal Fly — Cotton Stem-borer — Melon-Weevil — ilelon Stem-borer — Melon 

 Leaf Beetle— Diamond-back Moth — Cabbage Bug — Eigla Gall 'Weevil — Fig Stem- 

 boring Beetle — White Ants — Black Garden Ant. 



Plant Diseases Ordinance — Explanatory Note — Contents — Di'finitions — Articles 

 Exempted — Detailed Explanations of Contents. 

 A New Genus and Two New Species of Culicid.e from the Sudan. By 



F. V. Theobald 151 



Genus, Dicevomj/in : Dicernmi/ia nfriraii/t, n. .sp. — Cider siid'Hinisix. ii. s]i. 



