THE MONTHLY BULLETIN-. 405 



fruit fly exists ; the black diamonds, other forms of fruit flies. Between 

 these two parallel black lines are located the tropics. How many circles 

 can you find in the tropics ? Three : Hawaii, Teneriffe and St. Helena 

 Islands surrounded by ocean influences that virtually make them semi- 

 tropic. Look along both shores of the Mediterranean and see the black 

 circles — practically the same latitudes as California. As soon as you 

 enter the tropics you find other forms — a Dacus here in Senegal and also 

 in the Sudan. In the southern latitudes it is the same. At Cape Colony 

 Ceratitis, but immediately across the line Dacus sps. at Damara and at 

 Mauritius. In the tropics of Central and South America Ceratitis does 

 not occur excepting at Sao Paulo in Brazil, which, you see, is right on the 

 line. And now in Oceanica, Australia and India. Down in Australia, in 

 latitudes comparing with those of Europe, we have Ceratitis capitata at 

 its very worst, but in Queensland, as soon as we cross the line, other 

 forms of Dacus, Trypeta and Bivellia take its place. Throughout 

 Oceanica and India you see the black diamonds representing other forms 

 of fruit flies, all of which I have a full record of, but you do not see the 

 symbol that represents Ceratitis capitata. This should be sufficient evi- 

 dence that this pest not only thrives in, but seems to prefer, climates 

 similar to our own, and if in reality it is only "a gho.st" perhaps we had 

 better continue in our endeavors to keep it ' ' laid. ' ' 



San Francisco Guide. 



A few minutes ago I w^as speaking of the different steamship routes 

 entering the port of San Francisco, and I have introduced this picture, 

 which represents the San Francisco Guide, to explain to you how the 

 quarantine officers are enabled to keep in touch with the movements of 

 vessels at sea. There is one thing a master of a ship must do before he 

 sails, no matter what else he may neglect, and that is to take out his clear- 

 ance papers. Failure to do this is likely to result in his making the 

 acquaintance of a gunboat or a cruiser a few days later. The taking out 

 of these papers becomes a matter of record, and the collectors of marine 

 news promptly publish the same. The movements of all ships on the way 

 to San Francisco are published in the Guide. If a Cosmos liner leaves 

 Hamburg for San Francisco to-day, we find it recorded in the paper to- 

 morrow, and so on with all vessels concerned. The regular liners come 

 on schedule time, and the time of their arrival is set down on the left- 

 hand side each day under its proper date. It is amusing to watch the 

 boys come into the office in the morning (while as a matter of fact each 

 one has memorized the arrivals for the week), the first thing all of them 

 do is to go to the Guide with the statement "what's on the board for 

 to-day?" The comments that usually follow illustrate the fund of 

 information to be found on this single sheet. For instance, some one 

 will turn over the paper and, after looking over the reference column, 

 will remark: "Say, that Cosmos liner coming up from Punta Arenas 

 has been into Mazatlan. ' ' This fact invests the arrival of that ship with 

 an entirely different amount of importance. Mazatlan means Mexican 

 orange maggots. And so on, each time a ship en route for San Fran- 



