variable following an identical probability distribution as the arrival process. A new estimation method of the average travel time uses a crosscorrelation analysis of traffic flow measurement data. This method requires only traffic flow information, which is available from the measurements of single loop detectors upstream and downstream from one link. Different from the existing maximum cross...

S AND COMMENTS RISK FACTORS FOR FRACTURES IN THE ELDERLY H Jacqrningadda, A Founier, D Commenges and J F Dartigues, France .............. 221 USE OF TOENAIL FLUORIDE LEVELS AS AN INDICATOR FOR THE RISK OF HIP AND FOREARM FRACTURES IN WOMEN NEW, OR BIASED, EVIDENCE ON WATER FLUORIDATION D Feskanich, W Owusu, D J Hunter et a/, USA ................................................ 221 ................

We review the taxonomic history and assess the status of three genera of siphonopid caecilians from South America. Evidence from dentition and squamation suggest that Microcaecilia is paraphyletic with respect to Parvicaecilia. To avoid this paraphyly we propose to relegate the latter to the synonymy of the former. We find no evidence warranting any change in the taxonomic status of Brasilotyph...

S Effects of Fluoride on Immune System Function. Sheila L M Gibson, Scotland Cancer Incidence And Mortality In Workers Exposed To Fluoride. P Grandjean et a/, Denmark Clastogenic Adivrty of Sodium Fluoride In Great Ape Cells. K Kishi and T Ishida, Japan Serum Fluoride As An Indicator of Occupational Hydrofluoric Acid Exposure. K Kono el a/, Japan Comparison of the Effect of Sodium Fluoride and ...