214 Letters to the E(Wcr Vvti^n' 



Australia; as well a>: many other places in Australia. That these were *o <le* 

 lived is proved by marine fossils ipfl the un-dolomitized portions of the h»*e- 

 rtones. 



Other deposits of dolomites, namely, at Mt BUchoft, Tasmania ; ami Broken 



Hit!, New South Wales ; resulted from alteration of basic ami ultrabasic 

 intrusions by mineralizing solutions during deposition of the ores leaf!, copper, 

 jrinc, etc. 



Only one important deport of dolomite^ as a freshwater sedimentary rock, 

 occurs. This is at Comiadai, Victoria, where it is considered that tlierrttel 

 springs, occurring during Jake formation,' provided the necessary proportion 

 iH" magnesium earoouacc to form a dolomitlc rock. 



Yours faithfully 



Al.FkKD A. Bakek 

 Geology Department. University of Melbourne. 



NATURALISTS' NOTEBOOK 



• Reserved for your Notes, Observoharw and Queries) 

 SWALLOW AND MOTOR-BOAT 



During an enjoyable visit lo Mr. and Mrs. ftarrurt of Spcrtmvhale Head in 

 October, T saw the. nest of a Welcome Swallow on a ledge under the canopy 

 of then* motor-boat, There were eggs in it at the time, but no bird was on it. 

 "What happens when you leave home when the bird is not on the nest?" I 

 asked- ''She waits for m to come back," was the reply, ''or if we are too 

 long Stic flies across to Paynesville and finds the boat and settles down on 

 Ihe nest.'' Paynesville is four miles trOm the boats usual anchorage at Sperm- 

 svbale Head and there are many boats there. I do not know whether ;he 

 swallow has any difficulty in finding her own boat, but I hope her family is 

 iiovv hatched, in the nest lined with yuiiiea-fowl feathers. 



— Jean Galbraitji, Tyer.5 

 [Did the cgys hatch?— Editor] 



WHAT, WHERE AND WHEN 

 F.NX.V, Excursions: 



Easter (April IS to April iK) — Dtmboola, owler the leadership of the Wim- 

 mcrn Field Naturalists Club, Train leaves Spencer Street at 645 p.nv 

 NOTH ALTERED TIME. Other detail-, in test month's .VarumM or 

 from Excursion Secretary. 



Sunday, May 5— Botany Gruuy excursion to EmeraUl, Subject: Fongi_ Take 

 &55 a.m. train to Upper Fenitree Gully, then bus to Kmerald. 



Group Meeting*: 



(ft p.m. at National Herbarium) 

 Wednesday, April 1? — Microscopical Group. 

 Wednesday, Aiprj! 24 — Botany Group, Subject: Trees of Port Philhp Arc4- 



.^peaker: Mr, W, L. Williams. 

 Wednesday, May 1 — Geology Group. Subject What is Ccnimology 3 



Speaker : Mr. Davjilson. 

 Monday, \fay 6 — Marine Biology and Entomology Group. Meet & f> ft>- at 



private entrance at south end ot Parliament House. 

 Prelirti rnc ry Notice ; 



Saturday, June 1— Mystery Excursion: Rosebud area; Leader: Mr. C. Lewis, 

 Parlour coach will leave Batman Avenue at 9 a,m. Fare 16/. Bring two 

 meals. 



— Marie Aluwper. Excursion Secretary 



19 Hawthorn Avenue, Caulfield. S.E7. 



