vili CONTENTS 



Page 



Texts for articles — Other methods of obtaining co-operation — 

 Daily reports — -Records — Maps. 



CHAPTER 6.— Inland Drainage 99 



Importance of drainage as an anti-mosquito measure — Limitations 

 of drainage — Preliminary work — Types of inland drainage prob- 

 lems — Problem of pond, lake and swamp drainage — Treatment of 

 seepage outcrops — Drying up a swamp — Ditch construction in 

 general — Hand ditching on firm ground — Cost of ordinary 

 hand ditching — Hand ditching in swamps — Blasting ditches 

 in swamps — Making trial shots — Cleaning out the ditch — Ad- 

 vantages of blasting ditches — Machine ditching — Some typical 

 open-ditching machines — Maintenance of open ditches — The weed 

 burner — Maintenance costs — Permanent lining of anti-mosquito 

 ditches — -Sub-surface tile drains — Tile drains versus open ditches 

 — Laying out a tile drainage system — Placing the tile — Tile 

 drainage costs— Vertical drainage — Typical vertical drainage 

 operation — Vertical drainage for large areas — Stream re-chan- 

 eling — Blasting new channels — Clearing streams of logs, etc. — ■ 

 Filling. 



CHAPTER 7.— Salt Marsh Drainage 139 



The salt marsh problem in general — Agricultural "\ ersus anti-mos- 

 quito drainage of salt marshes — Design of salt marsh ditches — Salt 

 marsh ditching by hand — Machine ditching — Filling — Diking and 

 tide-gating in general — Constructing the dike — -The tide-gate and 

 sluice-box — Construction of sluices — Gate construction — Specifi- 

 cations for large sluices — Installation — Other types of tide-gates 

 — The Calco gate — Operation of tide-gates — Salt marsh shrinkage 

 — Pumping. 



CHAPTER 8.— Oiling 158 



Place of oiling in anti-mosquito work — Where oiling is applicable — 

 Applying the oil — Kind of oil required — Larvicides — The Panama 

 larvicide — Other larvicidal substances — The sprayer — Drip-cans — 

 Use of drip-cans — Other methods of applying oil — Frequency of 

 oiling — Distribution of oil — Storage of oil — Costs of oiling. 



CHAPTER 9.— Fish Control 172 



Advantages and limitations — How fish destroy larvae — The top 

 minnow (Gambusia affinis) — The barred killifish (Fundulus hetero- 

 clitus) — The striped killifish {Fundvlus majalis) — -The fresh-water 

 killy (Fundulus diaphanous) — The variegated minnow (Cyprinodon 

 variegatus) — The rain-water fish (Lucania parvia) — The spotted 

 top minnow (Fundulus notatus) — The star-headed minnow (Fun- 

 dulus notii) — Other fishes — Procedure in fish control — -Number 

 of fish required — Distributing the fish — Necessity of aiding the 

 fish — Plants in relation to fish control — Eliminating larva-pro- 

 tecting plants — The sub-aqueous saw — Using the saw. 



CHAPTER 10.— Screening 195 



Place of screening in anti-mosquito work — Rarity of good screen- 



